$a:green*0.8;
div{
    @include zx(500px,500px,$a);
    overflow: hidden;
    p{
        $b:red;
        @include zx(100px,100px,$b);
        float: left;
        text-align: center;
        a{
            display: block;
            @include zx(50px,50px,$a);
        }
    }
    span{
        @include zx(200px,200px,rosybrown);
        float: right;
    }
}
@mixin zx($w,$h,$c){
    width:$w;
    height:$h;
    background:$c;
}